These files contain references to the June Mail filing system and/or entries under the "JUNE" classification, extracts from June Mail files, and withdrawal cards noting where June Mail material was separated from a file.
July 1, 2017 Subject:
Persistance pays off
The vast majority of this file is reports of rooms being surveyed for surveillance devices. As far as I can see, there's only one case in which they actually found one (page 991)!
There's a second report of a bug being found on page 1359, but it's revealed a few pages later that this was the result of "a simple field strength meter brought to the RA by a person who did not understand how it operated."
I rather liked page 1228, where the Attorney General's office requested a security check of the phone in his car, and it had to be politely explained to them that it doesn't have any security at all because it's a carphone...